Metal catalyst and method for hydrogenolysis of cyclic compound using same

Abstract

[Problem] To perform selective hydrogenolysis of a cyclic compound that has a five-membered ring structure and that is included in a saturated cyclic compound used as a hydrogen carrier.[Solution] A metal catalyst used in hydrogenolysis of a cyclic compound that has a five-membered ring structure and that is included in a saturated cyclic compound used as a hydrogen carrier, comprises: a silica-based carrier as a catalyst carrier, and iridium or rhodium as a metal supported on the catalyst carrier.

1 . A metal catalyst used in hydrogenolysis of a cyclic compound that has a five-membered ring structure and that is included in a saturated cyclic compound used as a hydrogen carrier, comprising:
 a silica-based carrier as a catalyst carrier; and   iridium or rhodium as metal supported on the catalyst carrier.   
     
     
         2 . The metal catalyst according to  claim 1 , wherein:
 metal supported on the catalyst carrier is iridium; and   the metal catalyst includes 0.1 to 5 wt. % iridium as the metal.   
     
     
         3 . The metal catalyst according to  claim 1 , wherein:
 metal supported on the catalyst carrier is rhodium; and   the metal catalyst includes 0.5 to 2 wt. % rhodium as the metal.   
     
     
         4 . The metal catalyst according to  claim 1 , wherein the silica-based carrier includes amorphous silica. 
     
     
         5 . The metal catalyst according to  claim 1 , wherein the silica-based carrier includes MFI zeolite. 
     
     
         6 . A method for hydrogenolysis, using the metal catalyst according to  claim 1 , of a cyclic compound that has a five-membered ring structure and that is included in the saturated cyclic compound used as a hydrogen carrier, comprising:
 producing an aromatic compound, and a cyclic compound that has a five-membered ring structure as an impurity, by dehydrogenation of the saturated cyclic compound;   performing hydrogenation of the aromatic compound with the impurity mixed therein; and   performing hydrogenolysis of mixture of the saturated cyclic compound and the impurity as produced in the hydrogenation of the aromatic compound, using the metal catalyst.   
     
     
         7 . The method for hydrogenolysis according to  claim 6 , wherein the hydrogenolysis is performed by feeding the mixture of the saturated cyclic compound and the impurity to the metal catalyst with a catalyst layer thereof maintained at 150° C. to 300° C. together with 50 to 99.8 mol % hydrogen.